I watched the "Bearded Math Man's" latest video about breaking numbers into factors and perfect squares and commented that I could share it better if the license were changed from "Standard YouTube" to "CC-BY." He changed it :)
His math's a little more advanced than most of what I help students with but I like his attitude and explanations. (I'm sure we wouldn't agree on everything!) It's another example though of somebody being more than willing to make their work "legally sharable" :)